<template>
	<view>
		<view class="goods-list">
			<view v-for="(goods,i) in goodsList" :key="i" @click="gotoDetail(goods)">
				<my-goods :goods="goods"></my-goods>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				// 请求的query对象
				queryObj: {
					cid: '',
					query: '',
					pagenum: 1,
					pageSize: 10
				},
				// 商品列表
				goodsList: [],
				// 商品总数
				total: 0,
				// 节流阀：用于减少不必要的请求
				isloading: false
			};
		},
		onLoad(options) {
			this.queryObj.cid = options.cid || ''
			this.queryObj.query = options.query || ''
			
			this.getGoodsList()
		},
		methods:{
			async getGoodsList(cb) {
				// 打开节流阀
				this.isloading = true
				
				const {data : res} = await uni.$http.get('/api/public/v1/goods/search',this.queryObj)
				
				// 请求完毕 关闭节流阀
				this.isloading = false
				// 数据请求完毕 就立即按需调用 cb回调函数
				cb && cb()
				if(res.meta.status !== 200) return uni.$showMsg()
				this.goodsList = [...this.goodsList,...res.message.goods]
				this.total = res.message.total
			},
			gotoDetail(goods){
				uni.navigateTo({
					url: '/subpkg/goods_detail/goods_detail?goods_id=' + goods.goods_id
				})
			}
		},
		onReachBottom() {
			// 判断数据是否加载完毕
			if(this.queryObj.pageSize * this.queryObj.pagenum >= this.total) return uni.$showMsg('数据加载完毕！')
			
			//判断节流阀是否为true 为真就发请求
			if(this.isloading) return
			
			this.queryObj.pagenum++
			this.getGoodsList()
		},
		// 监听下拉刷新 
		onPullDownRefresh() {
			// 重置关键数据
			this.queryObj.pagenum = 1
			this.total = 0
			this.isloading = false
			this.goodsList = []
			
			// 重新发起请求
			this.getGoodsList(()=>uni.stopPullDownRefresh())
		}
	}
</script>

<style lang="scss">
	
</style>
